Dude, even the almighty mustang has piston slap, grind, broken transmissions, etc. if you read the interwebs. Oh, that garbage Chinese getrag, you know.
What I'm saying is, you are right, you can't judge your experience based on what other people's problems have been.
If that were the case, I would have never bought the S2000, because the differential explodes the 1st time you floor it, and the tops all get rip in them from the inside, etc. And I would never have bought the 350Z because everyone had their transmission replaced 4 times under warranty, the power window motors fail every other week, etc.
I don't have any issues with my 370Z. I feel bad for the people who do, but I don't believe I'm the exception to this, I believe there are a number of people with transmission issues and (whatever is causing) the bogging but it's not something I would worry about when buying the car.
I hate that these guys can't get any movement from the dealer on the problems. "It's normal" = ********.